CN1146151C - Light-wave tracking method and tracker - Google Patents
Light-wave tracking method and tracker Download PDFInfo
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- CN1146151C CN1146151C CNB991068122A CN99106812A CN1146151C CN 1146151 C CN1146151 C CN 1146151C CN B991068122 A CNB991068122 A CN B991068122A CN 99106812 A CN99106812 A CN 99106812A CN 1146151 C CN1146151 C CN 1146151C
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Abstract
The present invention discloses a light-wave wavelength tracking method in an optical fiber. A light tunable filter is arranged in the light transmission path of the optical fiber to realize on-line monitoring so that light transmitted in the optical fiber can enter the other optical fiber after jetted from one optical fiber through the light tunable filter. The light tunable filter outputs the light with different wavelengths in different positions, so the tracking of a light-wave wavelength is converted into the tracking of an optical fiber position, namely control for motor motion. Corresponding to the method, the present invention also comprises a light-wave wavelength tracking device in an optical fiber which is driven by a motor to make the optical fiber at an input end and the optical fiber at an output end move simultaneously and realize wavelength tracking.
Description
Technical field
The present invention relates to the tracking and the device of optical wavelength in a kind of optical fiber (the particularly optical fiber in the optical fiber telecommunications system).
Background technology
The appearance of fiber amplifier has promoted developing rapidly of optical fiber communication, and it not only can be exhibited one's skill to the full in long distance, extra long distance and orphan's communication, and also occupies critical role in passive photonic loop; Though the transmission range in multi-user system is shorter, the branch of user network is too many, and the optical signal power in the fiber optic backbone will carry out numerous distribution, or even repeatedly distributes; Each branch that has been assigned to like this or the light signal in the branch road just quite a little less than, can not guarantee the quality of reception of each user's terminal equipment, this just needs fiber amplifier that light signal is amplified.We can say that fiber amplifier is the sign of modern optical fiber communication, also noise is amplified when but fiber amplifier amplifies light signal, and itself also has spontaneous emission noise, when the light signal that receives after fiber amplifier amplifies, as not having filter, light signal will be flooded by noise.Optical sender is in the long-term degeneration owing to laser itself in service in addition, and the influence that is subjected to external environment condition, also have the non-linear factor of Transmission Fibers to cause optical wavelength that certain drift is arranged, this drift has certain influence to receiver, the performance of this drift meeting grievous injury system in DWDM (dense wave division multipurpose) particularly, this just requires wavelength is followed the tracks of.Equally, in other fibre systems,, then also need Wavelength-tracking if require relatively strictness maybe to need to carry out wavelength analysis to wavelength.
But adopting optical filter at present mainly is the filter of fixed wave length, and it can only though it is easy to use, can not reach the purpose of Wavelength-tracking, and its use be dumb at a certain fixed light wavelength output light signal.
Summary of the invention
Purpose of the present invention is exactly in order to overcome the above problems, and a kind of Wavelength-tracking method is provided, and the device of realizing this method, to reach tracking wavelengths, avoids the influence of wave length shift to transmission system, uses purpose flexibly.
The present invention realizes that the scheme of above-mentioned purpose comprises the tracking of optical wavelength in a kind of optical fiber telecommunications system, it is characterized in that: on the transmission light path of optical fiber, optic tunable filter is set, described optic tunable filter diverse location place thickness difference, thereby the optical wavelength difference of diverse location place output makes the light propagated in optical fiber penetrate after optic tunable filter enters another optical fiber from optical fiber wherein; With driven by motor this two optical fiber or optic tunable filter, two optical fiber are done synchronously on this optic tunable filter relatively moved; Make optic tunable filter in diverse location place output light wavelength difference, then the tracking of optical wavelength is converted into the tracking of fiber position, also promptly is converted into the control to motor movement.
The present invention realizes that the scheme of above-mentioned purpose also comprises a kind of device of realizing the tracking of above-mentioned optical wavelength, this device comprises motor, input end fiber, output optical fiber, diverse location place thickness difference, makes different optic tunable filter, the actuator assemblies of optical wavelength of diverse location output; The external light input end of input end fiber, its output light enters output optical fiber through optic tunable filter; Driven by motor input end fiber and output optical fiber or drive optic tunable filter are done input end fiber and output optical fiber and are synchronized with the movement on optic tunable filter; Motor links to each other with actuator assembly by cable, and actuator assembly links to each other with external control circuit by plug.
Owing to adopted above scheme, by the control of external control circuit to actuator assembly, drive motors and then drive input, output optical fiber moves on optic tunable filter, optical wavelength is followed the tracks of, so just can avoid the influence of wave length shift transmission system.And, utilize said method of the present invention and device in dense wave division multipurpose (DWDM) system, to select definite wavelength, thereby realize wavelength management, therefore, use flexibly.
Description of drawings
Fig. 1 is the block diagram of Wavelength-tracking device embodiment of the present invention.
Fig. 2 is the structural representation of the middle core of Wavelength-tracking device embodiment of the present invention.
Fig. 3 is middle detection and the shift circuit part schematic diagram of Wavelength-tracking device embodiment of the present invention.
Fig. 4 is an optical system structure schematic diagram having used Wavelength-tracking device of the present invention.
Fig. 5 is a spectroscopic analysis system structural representation having used Wavelength-tracking device of the present invention.
Embodiment
The tracking means of the optical wavelength among the present invention is to serve as according to designing with optical wavelength tracking proposed by the invention.The feature of this method is: (as the joint) is provided with optic tunable filter on the transmission light path of optical fiber, described optic tunable filter diverse location place thickness difference makes the light propagated in optical fiber penetrate after optic tunable filter enters another optical fiber from optical fiber wherein; With driven by motor this two optical fiber or optic tunable filter, two optical fiber are done synchronously on this optic tunable filter relatively moved; Make optic tunable filter in diverse location place output light wavelength difference, thereby the tracking of optical wavelength is converted into the tracking of fiber position, also promptly is converted into control motor movement.
Wherein optic tunable filter can be with a stairstepping optical filter or wedge shape filter, its diverse location place thickness difference, thus the optical wavelength of diverse location place output also will be different, can be used as above-mentioned purpose and use.
As for control to motor movement, can adopt negative feedback control, the light of output be told a part through optical branching device send in the detector, detected photoelectric current is sent into the control end of motor after signal processing, the motion of control motor is till detected optical wavelength meets the requirements.
Method of the present invention can also be used for dense wave division multipurpose (DWDM) system, to select the light of certain wavelength, realizes wavelength management.When being used for this purpose, can be with the motion of external signal ACTIVE CONTROL motor, so that select the light of suitable wavelength.
Providing one below can be with the optical wavelength tracking means embodiment of said method specific implementation.
Embodiment one: see Fig. 1, shown in be the tracking means of optical wavelength in a kind of optical fiber telecommunications system, comprise light input end 1, optical filter module 2, light output end 3 and control circuit.Wherein optical filter module 2 is cores of device, and its structure is seen shown in Figure 2, and it comprises motor 21, input end fiber 22, output optical fiber 23, optic tunable filter 24, actuator assembly 27; Input end fiber 22 connects light input end 1, and its output light enters output optical fiber 23 through optic tunable filter 24; Motor 21 drives input end fiber 22 and output optical fiber 23 is synchronized with the movement; Motor 21 links to each other with actuator assembly 27 by cable, and actuator assembly 27 links to each other with control circuit by plug 28.
Obviously, also can input end fiber 22 and output optical fiber 23 keep motionless with driven by motor optic tunable filter 24 motion, this can realize relatively moving between two optical fiber 22,23 and the optic tunable filter 24 equally.
See Fig. 1 again, described control circuit comprises control and testing circuit module 4, A/D and D/A conversion circuit 5, control unit 6; Control and the control section output of testing circuit module 4 link to each other with actuator assembly 27 in the optical filter module 2, its test section output links to each other with D/A converting circuit 5 with modulus, and modulus links to each other with control unit 6 again with the output of D/A converting circuit 5.Its signal flow is to roughly shown in arrow among Fig. 1: the output photo-signal of photo-detector 7 again after modulus and D/A converting circuit 5 are done analog-to-digital conversion, enters control unit 6 through control and testing circuit module 4; After 6 pairs of data of control unit are carried out analyzing and processing, send control signal after modulus and D/A converting circuit 5 carry out digital-to-analogue conversion,, adjust its action by control and testing circuit module 4 control optical filter modules 2.Wherein modulus and D/A converting circuit 5 adopt 12 device, can guarantee the precision of filter.
As the Wavelength-tracking device, be provided with negative feedback loop in the present embodiment.See Fig. 1, be provided with an optical branching device 31 at light output end 3, inject photo-detector 7 from the light part of optical branching device 31 outputs, the output of photo-detector 7 links to each other with the input of control with testing circuit 4.
If merely as the wavelength management device, then negative feedback loop can be set, directly send control signal by control unit 6.Also can both establish feedback loop, establish wavelength management controller (promptly realizing the device of aforementioned " by the motion of external signal ACTIVE CONTROL motor ") again, realize dual-use function, both can carry out Wavelength-tracking, can carry out wavelength management again.
See Fig. 3, have a fluid drive circuit, its input in to connect photo-detector 7 (photo-detector 7 is PIN detectors among the figure) in described control and the testing circuit 4, output out connects modulus and D/A converting circuit 5; Described fluid drive circuit comprises the resistance R 1-R4 of one group of analog switch K1-K4 and one group of different resistance; Described analog switch is smooth no saltus step ground gear shift under the control of CPU, with the Control and Feedback amount.PIN is light-operated survey device among the figure, and N is an operational amplifier.Wherein the resistance of R has determined feedback quantity, and by little and big, its feedback quantity is also by little extremely big to the R4 resistance for R1.The value of R1-R4 is respectively in this example: 100 Ω, 1K Ω, 10K Ω, 100K Ω can reach the dynamic range of 50dB.Wherein R1 and K1 series connection is the first via, and R2 and K2 series connection are the second the tunnel, and R3 and K3 series connection are Third Road, R4 and K4 series connection are the four the tunnel, between four the tunnel relation in parallel, the input in of the whole fluid drive circuit of back one termination in parallel, the output out of the whole fluid drive circuit of another termination; The input end grounding of amplifier N, the input in of the whole fluid drive circuit of another input termination, the output out of the whole fluid drive circuit of output termination.
In Wavelength-tracking device of the present invention, optical filter module 2 wherein is crucial parts.This module can individualism, uses as a product, not only can be used in the above-mentioned Wavelength-tracking device, can also be applied in relevant optical fiber sensing system, optical signal processing system.Provide two application example below.
Embodiment two: as Fig. 4, shown in be that another needs optical wavelength to follow the tracks of or optical system of wavelength management.Thick connecting line represents that light path connects among the figure, thin connecting line indication circuit line.The purpose of this optical system is light will be sent the light that is sent in the controlled device 81 to enter selectively in photaesthesia or the processing unit 83 to carry out relevant the processing by wavelength.The light that light transmission controlled device 81 sends is after optical switch is held concurrently splitter 84, and one the tunnel as main optical path, and directly transmission forward enters optical switch 85; Another road also enters optical switch 85 as monitoring and standby light path behind optical filter module 2.When input optical wavelength meets the requirements, the main optical path operate as normal, optical switch 85 enters in photaesthesia or the processing unit 83 light of main optical path, simultaneously optical filter module 2 monitoring light wavelength situations of change.When wavelength change and surpass permissible value, when maybe needing to change wavelength, optical filter module 2 by light path control, detection and loop control circuit 82 control light send controlled devices 81 changes its luminous wavelength, or the control optical switch splitter 84 of holding concurrently, main light is entered in the optical filter module 2, making in the former main optical path does not have optical transmission, and optical switch 85 enters in photaesthesia or the processing unit 83 light of standby light path simultaneously.Like this, because tracking, the management role of optical filter module 2, the optical wavelength that can guarantee to receive in device 83 is always satisfied the demand.
Embodiment three: see Fig. 5, shown in be a spectroscopic analysis system, to analyze the spectral characteristic of sensitive material 92.The light that wide spectrum light source 91 sends is behind sensitive material 92, because the effect of sensitive material 92 crest or trough can occur at some wavelength place in the spectrum.The introducing of optical filter module 2 is exactly in order to find these crests, trough.As long as the optical fiber 22,23 in the optical filter module 2 is done relative motion continuously, just can realize that wavelength is by the continuous sweep of an end to the other end on optic tunable filter 24.Scanning result is sent to data processing module 93 can carry out relevant the processing.
The foregoing description is to design for thought of the present invention is described, the execution mode in the reality is not limited only to example.
Claims (6)
1, the tracking of optical wavelength in a kind of optical fiber telecommunications system, it is characterized in that: on the transmission light path of optical fiber, optic tunable filter is set, described optic tunable filter diverse location place thickness difference, thereby the optical wavelength difference of diverse location place output makes the light propagated in optical fiber penetrate after optic tunable filter enters another optical fiber from optical fiber wherein; With driven by motor this two optical fiber or optic tunable filter, two optical fiber are done synchronously on this optic tunable filter relatively moved; Make optic tunable filter in diverse location place output light wavelength difference, then the tracking of optical wavelength is converted into the tracking of fiber position, also promptly is converted into the control to motor movement.
2, the tracking of optical wavelength in the optical fiber telecommunications system as claimed in claim 1, it is characterized in that: negative feedback control is adopted in the control of motor movement, the light of output is told a part through optical branching device to be sent in the detector, detected photoelectric current is sent into the control end of motor after signal processing, the motion of control motor.
3, a kind of device of realizing optical wavelength tracking as claimed in claim 1, it is characterized in that: comprise motor (21), input end fiber (22), output optical fiber (23), diverse location place thickness difference, make different optic tunable filter (24), the actuator assemblies (27) of optical wavelength of diverse location output; The external light input end of input end fiber (22), its output light enters output optical fiber (23) through optic tunable filter (24); Motor (21) drives input end fiber (22) and output optical fiber (23) or drives optic tunable filter (24), input end fiber (22) and output optical fiber (23) is done on optic tunable filter (24) be synchronized with the movement; Motor (21) links to each other with actuator assembly (27) by cable, and actuator assembly (27) links to each other with external control circuit by plug (28).
4, device as claimed in claim 3 is characterized in that: also include control circuit, it comprises control and testing circuit module (4), A/D and D/A conversion circuit (5), control unit (6); Control links to each other with actuator assembly (27) by plug (28) with the control section output of testing circuit module (4), its test section output links to each other with A/D and D/A conversion circuit (5), and the output of A/D and D/A conversion circuit (5) links to each other with control unit (6) again;
Also be provided with an optical branching device (31) at output optical fiber (23), inject photo-detector (7) from the light part of optical branching device (31) output, the output of photo-detector (7) links to each other with the input of control with testing circuit module (4).
5, device as claimed in claim 4 is characterized in that: in described control and the testing circuit module (4) a fluid drive circuit is arranged, it imports termination photo-detector (7), output termination A/D and D/A conversion circuit (5); Described fluid drive circuit comprises the resistance R 1-R4 and the amplifier N of one group of analog switch K1-K4 and one group of different resistance, wherein R1 and K1 series connection is the first via, R2 and K2 series connection are the second the tunnel, R3 and K3 series connection are Third Road, R4 and K4 series connection are the four the tunnel, between four the tunnel relation in parallel, the input in of the whole fluid drive circuit of back one termination in parallel, the output out of the whole fluid drive circuit of another termination; Described analog switch is smooth no saltus step ground gear shift under the control of CPU, with the Control and Feedback amount; The input end grounding of amplifier N, the input in of the whole fluid drive circuit of another input termination, the output out of the whole fluid drive circuit of output termination.
6, device as claimed in claim 3 is characterized in that: thickness different optic tunable filter in described diverse location place is stairstepping optical filter or wedge shape filter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991068122A CN1146151C (en) | 1999-05-24 | 1999-05-24 | Light-wave tracking method and tracker |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB991068122A CN1146151C (en) | 1999-05-24 | 1999-05-24 | Light-wave tracking method and tracker |
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| CN1275003A CN1275003A (en) | 2000-11-29 |
| CN1146151C true CN1146151C (en) | 2004-04-14 |
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| CNB991068122A Expired - Fee Related CN1146151C (en) | 1999-05-24 | 1999-05-24 | Light-wave tracking method and tracker |
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| CN110192359B (en) * | 2016-12-09 | 2020-12-15 | 华为技术有限公司 | Apparatus and method for tracking optical wavelengths |
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